if you have confirmed that your device runs either ICS or JB (you can check in the settings menu by clicking on Settings, then scrolling down to About Phone). Next you need to install Tun.ko installer, the purpose of installing this app is to confirm that your phone has the Run module preloaded with the device (most android phones running Android 4.0+ has this by default). If your phone has it then you are good to go and can proceed with the steps below

Step 1. After installing DroidVPN on your phone, go to the settings menu and change the connection protocol to UDP Step 2. Click on the box beside use DroidVPN without root access Step 3. Scroll to the set UDP port and enter 500 after you have done these you can now go back to the main app screen and click on the ON button to connect.